JP2022072170A - Gusset bag sealing and cutting device - Google Patents

Abstract

To reduce the size of a device and to improve product productivity even while sealing a gusset bag by a cartridge heater system.SOLUTION: A gusset bag sealing and cutting device includes: a pair of heater bars 12, 14 comprising a cartridge heater 16, for sealing an opening of a film F; a pair of film pressers 30, 40 for pressing the film F; and a cutter 50 for cutting the film F, and is formed into a wave shape in a side direction where the tips of the heater bars 12, 14 are engaged with each other. This configuration enables sealing at a temperature lower than conventionally, and eliminates some of conventionally used heat pipes and cooling plates. Thus, the size of the device can be reduced. Moreover, the melted film F hardly adheres to the heater bars 12, 14 without using a glass tape or the like; thus, there is no time and labor for removing the stuck film F or a glass tape, and product productivity can be improved.SELECTED DRAWING: Figure 6

Description

The present invention relates to a gusset bag sealing and cutting device.

Conventionally, various devices have been used to seal the opening of a packaging bag after a packaging bag made of a tubular film is filled with an absorbent product such as a menstrual pad or a disposable diaper. Has been developed. For example, in the seal / cutting device of Patent Document 1, a heat member that seals by welding, a presser that presses the film, a blade that cuts the film, and a presser that presses the film are placed above the supplied film in this order. A receiving member is provided along the supply direction, and further below the film, a presser and a heat member are pressed via the film. That is, this seal / cutting device cuts the film by sandwiching the film between the heat member and the receiving member and welding the film, and lowering the blade while pressing the film between the presser and the receiving member before and after the blade. It is a thing.

Further, the invention of Patent Document 2 is for sealing a packaging bag (gusset bag) with a gusset, and is formed in a pair of upper and lower heat seal bars and a notch formed at the tip of the upper heat seal bar. It is provided with a fusing blade attached via a heat insulating material, and the bag is sandwiched between the upper heat seal bar and the fusing blade and the lower heat seal bar to perform heat welding and fusing at the same time. Further, Patent Document 2 also discloses a form in which the excess portion of the gusset bag is cut by a cutting blade instead of a fusing blade. When a cutting blade is used for a gusset bag, a method of cutting while pressing the bag before and after the cutting blade is also adopted as in the invention of Patent Document 1. In all of these conventional inventions, the bag is sealed by welding, but the heater bars such as the heat member and the heat seal bar for that purpose are generally of the nichrome wire type and the cartridge heater type. There is.

Jikkenhei 5-62410 Gazette Japanese Unexamined Patent Publication No. 2004-238005

Here, when the above-mentioned nichrome wire method is adopted for the heater bar, it is necessary to cover the exposed nichrome wire with a glass tape or the like, the glass tape or the like needs to be replaced frequently, and the melted glass tape or the like is used. There are multiple problems such as the fact that it adheres to the heater bar and it takes time to remove it, and that the shape of the tip of the heater bar must be flattened. Especially in the case of a gusset bag, the folds on both sides in the width direction are thick and the center is thin, so if the tip shape of the heater bar is flat, the gap between the top and bottom can be adjusted to zero over the entire width direction. It is difficult and the quality of the seal may deteriorate. Also, in order to reduce the trouble of replacing the glass tape, some devices incorporate a retractable glass tape, but the distance between the heater bar and the cutting blade increases by that amount, which is the same as that of the gusset bag. It is reflected in the length of the ear that remains on the edge, which is not preferable from the viewpoint of material saving and aesthetics.

On the other hand, when the cartridge heater method is adopted for the heater bar, there is no restriction to flatten the tip of the heater bar, but cooling plates are externally attached to the front and back of the heater bar for heat insulation, and heat is evenly distributed throughout the heater bar. Since a heat pipe is incorporated to disperse the heat pipe, the size of the device is larger than that of the nichrome wire method, and the degree of freedom in setting the position is reduced. As a result, for example, the distance between the heater bar and the cutting blade becomes large, and the length of the ear remaining at the end of the gusset bag becomes large. Also, unlike the nichrome wire method, since the nichrome wire is not exposed, glass tape or the like can be changed to a coating, but for example, if the tip of the heater bar is flat, the film melts even if it is coated. In the end, we had no choice but to use glass tape or the like, which adversely affected the productivity of the product.

The present invention has been made in view of the above problems, and an object of the present invention is to reduce the size of the device and improve the productivity of the product while sealing the gusset bag by the cartridge heater method. be.

(Aspect of the invention)
The following aspects of the invention exemplify the configurations of the present invention and are described separately in order to facilitate understanding of the various configurations of the present invention. Each section does not limit the technical scope of the present invention, and some of the components of each section are replaced, deleted, or further while taking into consideration the best mode for carrying out the invention. Those to which the constituent elements of the above are added can also be included in the technical scope of the present invention.

(1) The film is sealed with the opening of the film filled with the product inside for forming the gusset bag, and the opening direction of the opening with the product side as the front side is the front-back direction. A gusset bag sealing and cutting device that cuts the excess portion on the rear side of the sealed portion of the film, moves in the vertical direction in a manner approaching each other, and sandwiches the opening of the film from above and below to seal. A pair of film pressers that move in the vertical direction so as to approach each other at a position close to the pair of heater bars on the rear side, and a pair of film pressers that sandwich and press the film from above and below, and the pair of films. It moves together with the film presser on the upper side of the presser, and in a state where the film is sandwiched between the pair of heater bars and the pair of film pressers, it moves downward independently of the upper film presser to cut the film. The pair of film retainers sandwich the film at least on the rear side of the cutter, the pair of heater bars are configured by a cartridge heater, and the tip of the film sandwiching is the tip thereof. A gusset bag sealing and cutting device, characterized in that a pair of heater bars engage with each other to form a wavy shape along the lateral direction in the front-rear direction.

The gusset bag sealing and cutting device described in this section is intended for a gusset bag formed of a film and filled with a product, and includes a pair of heater bars, a pair of film retainers, and a cutter. Includes. The pair of heater bars are responsible for sealing the film, and move in the vertical direction so as to approach each other and sandwich the opening of the film from above and below to weld and seal the film. The pair of film pressers move in the vertical direction in such a manner as to approach each other, and by sandwiching the film from above and below, the film is pressed and fixed for cutting the film. At this time, since the pair of film pressers are arranged at positions close to the pair of heater bars on the rear side, the pair of film pressers press the positions close to the seal portion of the film sealed by the pair of heater bars. Further, the pair of film retainers are designed to sandwich the film at least on the rear side of the cutter.

The cutter is responsible for cutting the film, and moves together with the film presser on the upper side of the pair of film pressers, and the film is sandwiched between the pair of heater bars and the pair of film pressers as described above, and the upper side thereof. The film is cut by moving downward independently of the film retainer. Here, since the cutter that moves with the upper film presser is arranged close to the film presser, it is closer to the rear side with respect to the pair of heater bars, and the film sealed by the pair of heater bars. The position close to the seal part will be cut. Moreover, since the pair of film pressers sandwich the film at least on the rear side of the cutter, the cutter is sandwiched between the film portion sandwiched by the pair of film pressers and the film portion sandwiched by the pair of heater bars. , The film will be cut.

In the gusset bag sealing and cutting device described in this section, since the pair of heater bars is composed of a cartridge heater, it is not necessary to cover the unexposed nichrome wire with glass tape or the like, and the tip shape of the heater bar is formed. There are no restrictions on flattening. Therefore, the pair of heater bars has a wave shape along the side direction in the front-rear direction so that the shape of the tip sandwiching the film engages with each other. As a result, the area in contact with the film is larger than when the tip shape is flat, and the tension of the film is stretched at the apex of the wave at the tip of the heater bar, and the film is sealed at the apex. In addition, the wrinkles of the film are smoothed and pressure is more likely to be applied than when the film is sealed on a flat surface.

For this reason, not only the adjustment of the upper and lower gaps of the heater bar becomes unnecessary, but also the sealing is performed at a lower temperature than before, and the sealing is stable even if the heat pipe is not incorporated. Further, since the temperature becomes lower than the conventional one, the cooling plate on the film pressing side is not required among the external cooling plates conventionally attached to the front and back of the heater bar. Therefore, despite the fact that the cartridge heater is used for the heater bar, the size of the device is suppressed to make it compact, and the degree of freedom in setting the position is increased. In particular, the elimination of one cooling plate reduces the distance between the heater bar and the film retainer, in other words, the distance between the heater bar and the cutter, so the ears that remain at the end of the gusset bag. The length of is smaller.

Further, since the tip of the pair of heater bars is wavy and the temperature is lower than that of the conventional one, it is difficult for the melted film to adhere to the pair of heater bars even if a glass tape or the like is not used. Therefore, the labor of removing the adhered film is suppressed, and the labor of replacing the glass tape or the like and the labor of removing the melted glass tape or the like from the heater bar are not required, so that the productivity of the product is improved. be. In addition, the description such as "front-back direction", "front side", and "rear side" here is used exemplary to show the positional relationship of each element with respect to the opening direction of the opening of the film. However, it does not limit the actual orientation of the device or the flow direction of the product.

(2) In the above item (1), the pair of heater bars is a gusset bag sealing and cutting device having a coated tip. The gusset bag sealing and cutting device described in this section is a pair of heater bars. Since the tip that sandwiches the film is coated, the melted film does not adhere. Therefore, it is not necessary to remove the adhered film, and the productivity of the product is further improved.

(3) In the above items (1) and (2), the pair of film pressers are a first presser portion for sandwiching the film on the front side of the cutter and a second presser portion for sandwiching the film on the rear side of the cutter. A gusset bag sealing and cutting device with and.
In the gusset bag sealing and cutting device described in this section, a pair of film pressers that press the film for cutting by the cutter hold the film on the front side of the cutter and the film on the rear side of the cutter. It has a second presser portion to be sandwiched. Therefore, when the film is cut, the cutter that moves together with the upper film presser moves downward while being accommodated between the first presser portion and the second presser portion of the upper film presser. Then, with the first presser portions of the pair of upper and lower film pressers sandwiching the film and the second presser portions of the pair of upper and lower film pressers sandwiching the film, the cutter is further lowered independently of the upper film presser. The film is cut by the cutter by moving to and descending between the first presser portion and the second presser portion of the lower film presser. In this way, with the front and rear sides of the film pressed, the film is cut between them by a cutter, so that the quality of cutting is stable.

(4) In the above items (1) and (2), the pair of film retainers sandwich the film only on the rear side of the cutter. A gusset bag sealing and cutting device.
The gusset bag sealing and cutting device described in this section has a structure in which a pair of film retainers do not sandwich the film on the front side of the cutter, but sandwich the film only on the rear side of the cutter. That is, the pair of film pressers do not have a portion for pressing the film between the cutter and the heater bar in the front-rear direction. As a result, the distance between the pair of heater bars and the cutter becomes smaller, and the length of the ears remaining at the end of the gusset bag becomes smaller. Even if the heat of the heater bar is transferred to the cutter by moving the cutter closer to the heater bar, it is considered that there is no particular effect.

Further, because of the above configuration, when cutting the film, the cutter moves downward together with the upper film presser, the upper and lower pair of heater bars sandwich the film, and the upper and lower pair of film pressers sandwich the film. In this state, it moves further downward independently of the upper film retainer. Then, the cutter cuts the film fixed by the pair of heater bars and the pair of film retainers. In this way, the pair of heater bars is used not only for sealing the film, but also for pressing the film together with the pair of film pressers when cutting the film. At this time, the pair of heater bars are used together. The wavy shape of the engaging tip ensures that the film is stably fixed. Therefore, although the structure of the pair of film retainers is simplified, the film is cut by the cutter in a sufficiently stretched state, and the cutting quality of the film is maintained.

(5) In the above items (1) to (4), in the pair of film pressers, the tip of one film presser has a ridge extending in the lateral direction, and the tip of the other film presser is the tip of the film presser. A gusset bag sealing and cutting device with a concave groove extending laterally.
In the gusset bag sealing and cutting device described in this section, the tip of one of the film pressers forms a ridge extending in the lateral direction, and the tip of the other film presser is on the side. It forms a recess extending in the direction. Therefore, when the pair of film pressers are close to each other and sandwich the film, the tips of the pair of film pressers are engaged with each other by the convex and concave stripes, which pulls the film. The quality of the cutting performed by the cutter is more stable. Moreover, since the combination of the ridges and dents extending in the lateral direction of the pair of film pressers uniformly pulls the entire width direction of the film, for example, the tip shape in which irregularities are repeatedly provided along the lateral direction. Compared to the above, the presser marks are less likely to remain on the film, and the aesthetic appearance of the product is not spoiled.

(6) In the above item (5), the pair of film pressers is a gusset bag sealing and cutting device in which the tip of one film presser is formed of an elastic member and the other film presser is formed of a rigid member.
In the gusset bag sealing and cutting device described in this section, the tip of one of the film pressers is formed of an elastic member that allows elastic deformation, and the other film presser is elastically deformed. It is formed by a rigid member that suppresses. Therefore, for example, when the tip of the film presser having the tip shape of the convex strip is formed by the elastic member, the tip forming the convex strip is formed with respect to the concave tip of the film presser formed by the rigid member. The film is pressed while being elastically deformed, and the film can be pressed stably without any gaps. Similarly, when the tip of the film presser having the tip shape of the recess is formed by an elastic member, the tip forming the recess is elastic with respect to the tip of the film presser formed by the rigid member. The film is pressed while being deformed, and the film can be pressed stably without any gaps. Further, in any case, the convex and the concave are in close contact with each other without directly depending on the depth of the concave of the concave, so that the depth of the concave of the concave is formed shallow. Therefore, the extra slack of the film is avoided.

(7) In the above item (6), a gusset bag sealing and cutting device in which the elastic member is silicon rubber and the rigid member is a heat-resistant resin.
In the gusset bag sealing and cutting device described in this section, the elastic member forming the tip of one film presser is silicon rubber, and the rigid member forming the other film presser is heat-resistant resin. Here, as described in the above item (1), among the external cooling plates conventionally attached to the front and back of the heater bar, if the cooling plate on the film presser side is eliminated, the heater bar and the film presser are adjacent to each other. It will be. For this reason, heat is easily transferred to the film presser, but since it is made of silicon rubber or a heat-resistant resin, it is less likely to be affected by heat.

(8) In the above items (1) to (7), the tip blade of the cutter forms a triangular wavy shape along the lateral direction in the front view, and the triangular shape is formed from the center of the lateral direction toward both sides in the lateral direction. A gusset bag sealing and cutting device with a wavy tilt slightly upwards.
In the gusset bag sealing and cutting device described in this section, the tip blade of the cutter has a triangular wavy shape along the lateral direction when viewed from the front in the front-rear direction. In other words, a plurality of triangular blades are formed. It is a so-called jagged blade with jagged edges. Further, also in front view, the tip blade of the cutter has a triangular wavy shape slightly inclined upward from the center in the lateral direction toward both sides in the lateral direction, so that the blade near the center in the lateral direction is in the lateral direction. It protrudes downward from the blades near both sides of the. As a result, the film is gradually cut from the vicinity of the center in the width direction (side direction) toward both sides by the cutter, so that an extra load is applied to the film retainer and the heater bar sandwiching the film at that time. It will be cut smoothly without any damage.

Since the present invention has the above-mentioned configuration, it is possible to suppress the size of the device and improve the productivity of the product while sealing the gusset bag by the cartridge heater method.

It is a perspective view schematically showing an example of the structure of the seal and cutting apparatus of the gusset bag which concerns on embodiment of this invention. It is a side view of the sealing and cutting apparatus of the gusset bag of FIG. A pair of heater bars for the sealing and cutting device of the gusset bag of FIG. 1 are shown alone, (a) is a front view, and (b) is an enlarged view in a state where the tips are closed. It is a front view which shows the cutter of the sealing and cutting apparatus of the gusset bag of FIG. 1 by itself. It is an image diagram which shows the state of sealing a film by the sealing and cutting apparatus of the gusset bag of FIG. 1 from the side. The film is cut by the seal and cutting device of the gusset bag of FIG. 1, (a) is an image view shown from the side surface, and (b) is an enlarged view of the vicinity of the cut portion of (a). Another embodiment of the gusset bag sealing and cutting device according to the embodiment of the present invention is shown in an enlarged view corresponding to FIG. 6 (b).

Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings. Here, detailed description of the same parts or the corresponding parts as in the prior art will be omitted, and the same parts or the corresponding parts are indicated by the same reference numerals throughout the drawings.
1 and 2 show an example of the configuration of the gusset bag sealing and cutting device 10 according to the embodiment of the present invention. In addition, in FIG. 1, in a device adjacent to the gusset bag sealing and cutting device 10, the upper side and both sides are fixed on the discharge conveyor 90 by the product upper presser 92 and the product lateral presser 94, and are not shown. The figure also shows a gusset bag (packaging bag with a gusset) W in a state where the surface on the far right side in the figure is pressed by a stopper.

This gusset bag W is formed on one opening of a tubular film F cut in bag units (on the right back surface in FIG. 1 described above) in the pre-process leading up to the sealing and cutting device 10 of the gusset bag. After the (located) is closed, the product is filled inside through the other opening. That is, the gusset bag sealing and cutting device 10 of the present embodiment seals the other opening of the film F and cuts the excess portion of the film F for the gusset bag W in the above state. Is. Hereinafter, for convenience of explanation, the front-back direction with the right side in FIG. 2 as the front, the direction orthogonal to the paper surface in FIG. 2 as the side direction, and the vertical direction in FIG. 2 as the vertical direction will be described. Note that FIG. 1 shows the gusset bag W after the opening on the other side (rear side) is sealed by the gusset bag sealing and cutting device 10.

As shown in FIGS. 1 and 2, the gusset bag sealing and cutting device 10 according to the embodiment of the present invention includes a pair of upper and lower heater bars 12, 14, a pair of upper and lower film retainers 30, 40, a cutter 50, and cooling. It includes plates 60, 62, ear recovery nozzle 86, and the like. All of these members are configured to extend laterally so as to correspond to the length of the film F in the width direction. As will be described later, the pair of upper and lower heater bars 12 and 14 are for heating and sealing the film F while sandwiching the film F. Each of the heater bars 12 and 14 is of a cartridge heater type including a cartridge heater 16, and in the present embodiment, it is tapered toward the tips 12a and 14a facing each other in a lateral view as shown in FIG. It has a shape that becomes.

Further, in the pair of heater bars 12 and 14, as shown in FIG. 3A, the tips 12a and 14a have a wave shape along the lateral direction (the left-right direction in FIG. 3A), in other words. Then, the unevenness is alternately and repeatedly provided along the lateral direction. Then, as described later, when the heater bars 12 and 14 approach each other and collide with each other, the tips 12a and 14a engage with each other as shown in FIG. The positional relationship is such that they mesh with each other. Further, the pair of heater bars 12 and 14 is coated with, for example, a fluorine-based resin coating material in a range including at least the tips 12a and 14a thereof.

Returning to FIGS. 1 and 2, the pair of upper and lower film pressers 30 and 40 are for sandwiching and pressing the film F as described later, and the pair of heater bars 12 and 14 have their tips facing each other. Adjacent to the rear side of. With reference to FIG. 5, each of the pair of film pressers 30 and 40 of the present embodiment includes first presser portions 32 and 42 and second presser portions 34 and 44, respectively. More specifically, the upper film presser 30 has a first presser portion 32 located on the rear side (left side in FIG. 5) of the upper heater bar 12 and a second presser portion located on the rear side of the first presser portion 32. A section 34 is provided, and a cutter 50 is housed between them. Further, the lower film presser 40 includes a first presser portion 42 located on the rear side of the lower heater bar 14 and a second presser portion 44 located on the rear side of the first presser portion 42. There is a space between them.

In the upper film presser 30, a portion including the tip 32a of the first presser portion 32 and the tip 34a of the second presser portion 34 is formed of an elastic member that allows elastic deformation, in the present embodiment, silicon rubber, and other portions. Is formed of a heat-resistant resin or the like. Further, substantially the entire lower film retainer 40 is formed of a rigid member that suppresses elastic deformation, and in this embodiment, a heat-resistant resin. Further, in the pair of film pressers 30 and 40 of the present embodiment, as shown in FIG. 6B, the tip 32a of the first presser portion 32 of the upper film presser 30 and the tip 34a of the second presser portion 34 are A ridge extending in the lateral direction (direction orthogonal to the paper surface in FIG. 6B) is formed, and the tip 42a of the first presser portion 42 and the tip 44a of the second presser portion 44 of the lower film presser 40 are formed. , It has a dent extending in the lateral direction. That is, the tips 32a and 34a of the upper film retainer 30 are uniformly provided with convex portions that taper downward in the side view as shown in FIG. 6B. .. Further, the tips 42a and 44a of the lower film retainer 40 are uniformly provided with recesses recessed downward in the side view as shown in FIG. 6B.

As described above, the cutter 50 is housed between the first presser portion 32 and the second presser portion 34 of the upper film presser 30, and has a shape as shown in FIG. 4 in front view in the present embodiment. are doing. That is, the cutter 50 has a tip blade 50a called a so-called serrated blade that forms a triangular wavy shape along a lateral direction (left-right direction in FIG. 4), and the tip blade 50a includes a plurality of triangular blades 52. The tip blade 50a is housed between the first pressing portion 32 and the second pressing portion 34 with the tip blade 50a facing downward. Further, the triangular wavy shape of the tip blade 50a is slightly inclined upward from the lateral center C of the cutter 50 toward both sides in the lateral direction, whereby the plurality of triangular blades 52 are sideways from the lateral center C. The triangular blade 52 is provided in such a manner that the position of the triangular blade 52 gradually shifts upward toward both sides in the direction. In the present embodiment, the inclination angle R of the tip blade 50a in a triangular wave shape with respect to the lateral direction is about 2 °, although not limited to this.

With reference to FIGS. 2 and 5, the cooling plates 60 and 62 are for suppressing heat transfer from the pair of heater bars 12 and 14 to the film F forming the gusset bag W, and are for suppressing heat transfer. 60 is provided on the front side of the upper heater bar 12, and the cooling plate 62 is provided on the front side of the lower heater bar 14, respectively. In these cooling plates 60 and 62, for example, the air passing through the flow path provided inside is from the tip of the upper cooling plate 60 facing the lower left in the figure and the tip of the lower cooling plate 62 facing the upper left in the figure. It has a structure that is blown out. Further, the ear recovery nozzle 86 is installed adjacent to the rear side of the lower film retainer 40, and as will be described later, the excess portion of the film F cut by the cutter 50 is cut from the opening facing upward. It is designed to be sucked and discharged from the discharge duct 88.

Referring to FIGS. 1 and 2, the upper heater bar 12, the upper film retainer 30, and the cooling plate 60 are directly or indirectly fixed to the cross beam 64, and the lower heater bar 14, lower. The side film retainer 40, the cooling plate 62, and the ear recovery nozzle 86 are directly or indirectly fixed to the cross beam 66. These cross beams 64 and 66 are provided on the posts 70 and 72 erected on both sides so as to be vertically movable via the sliders 74 and 76. The coupling portions 78 and 80 are fixed to each of the sliders 74 and 76, and one end of a drive rod (not shown) is pin-connected to the coupling portions 78 and 80. Then, by a drive member (not shown), the drive rod connected to the coupling portion 78 and the drive rod connected to the coupling portion 80 are driven so as to move up and down in opposite directions. Then, when the cross beam 64 descends, the cross beam 66 rises, moves so that the upper heater bar 12 and the lower heater bar 14 come close to each other and abuts against each other, and at the same time, the upper film retainer 30 and the lower side The film retainer 40 is moved so as to be close to the film retainer 40. Further, when the cross beam 64 rises, the cross beam 66 descends and moves so that the upper heater bar 12 and the lower heater bar 14 are separated from each other, and the upper film presser 30 and the lower film presser 40 are separated from each other. And move away from each other.

When the cross beam 64 moves up and down, the cooling plate 60 and the cutter 50 housed in the upper film presser 30 also move up and down together with the upper heater bar 12 and the film presser 30. Further, a drive mechanism such as a cylinder is attached to the cross beam 64, and these drive mechanisms cause the upper film presser 30 to move up and down independently of the cross beam 64 and further to be independent of the upper film presser 30. The cutter 50 moves up and down. On the other hand, when the cross beam 66 moves up and down, the cooling plate 62 and the ear recovery nozzle 86 move up and down together with the lower heater bar 14 and the film retainer 40.

Next, the operation when the opening of the film F forming the gusset bag W is sealed and the excess portion is cut by the gusset bag sealing and cutting device 10 according to the embodiment of the present invention will be described. First, as shown in FIGS. 1 and 2, in a state where the cross beam 64 is raised and the cross beam 66 is lowered, the front opening is closed and the product is filled inside from the rear opening. , The gusset bag W is placed on the discharge conveyor 90. Then, the gusset bag W is pressed by the product upper presser 92, the product horizontal presser 94, a stopper (not shown), etc. As the cross beam 64 begins to descend, the cross beam 66 begins to rise. Also, substantially at the same time, a pair of gusset members (not shown) start to move laterally toward both sides of the opening on the rear side of the gusset bag W so as to approach each other.

By the above operation, the pair of upper and lower heater bars 12 and 14 and the pair of upper and lower film retainers 30 and 40 approach each other while the both sides of the opening of the gusset bag W are folded inward by the pair of gusset members. The opening of the gusset bag W is closed. Then, as shown in FIG. 5, the portion where the opening of the film F is closed is sandwiched and sealed by the pair of upper and lower heater bars 12 and 14. At this time, as shown in FIG. 3A, the pair of heater bars 12 and 14 have tips 12a and 14a having a wave shape along the lateral direction so as to mesh with each other. As shown in b), when the tips 12a and 14a engage with each other, the film F is sandwiched between the apex 20 of the convex portion and the valley bottom 22 of the concave portion while applying tension to the film F.

Further, as shown in FIG. 6, the drive mechanism on the cross beam 64 lowers the upper film presser 30 independently of the cross beam 64, so that the first presser portion 32 and the second presser portion of the upper film presser 30 are lowered. The rear side of the seal portion of the film F sealed by the heater bars 12 and 14 is sandwiched between the first presser portion 42 and the second presser portion 44 of the lower film presser 40. At this time, as shown in FIG. 6B, the tips 42a of the first pressing portion 42 and the tips of the second pressing portions 44, which are formed of a heat-resistant resin which is a rigid member and form a concave groove along the lateral direction. With respect to 44a, the tip 32a of the first presser portion 32 and the tip 34a of the second presser portion 34, which are formed of silicon rubber which is an elastic member and form ridges along the lateral direction, are pushed into the 44a. Then, the film F is sandwiched in a state where tension is applied between them.

Subsequently, by the drive mechanism on the cross beam 64, the cutter 50 accommodated between the first presser portion 32 and the second presser portion 34 of the upper film presser 30 is replaced with the first presser of the lower film presser 40. The film F is cut by descending to the space between the portion 42 and the second pressing portion 44. After that, when the cutter 50 is accommodated and the upper film presser 30 rises, the film F sandwiched between the upper and lower second presser portions 34 and 44 located on the rear side of the cut portion by the cutter 50. The excess portion is released, sucked by the ear collection nozzle 86, and discharged from the discharge duct 88. Further, as shown in FIGS. 1 and 2, the cross beam 64 rises and the cross beam 66 descends due to the upward movement of the drive rod connected to the joint portion 78 and the downward movement of the drive rod connected to the joint portion 80. Move to a suitable position. This completes the operation of sealing and cutting the film F forming the gusset bag W by the gusset bag sealing and cutting device 10.

Here, in the gusset bag sealing and cutting device 10 according to the embodiment of the present invention, the pair of film pressers 30 and 40 can take a form in which the first presser portions 32 and 42 are not provided. In this case, for example, as shown in FIG. 7, the film F is sandwiched and sealed by the pair of heater bars 12 and 14, and the second presser portions 34 of the pair of heater bars 12 and 14 and the pair of film pressers 30 and 40 are sealed. , 44 cuts the film F with the film F sandwiched between the front and back of the cutter 50.

Further, the gusset bag sealing and cutting device 10 according to the embodiment of the present invention is not limited to the configuration shown in FIGS. 1 to 7, and may have another configuration. For example, the shapes of the tips 12a and 14a of the pair of heater bars 12 and 14 are not limited to the shapes shown in FIG. 3 (b) as long as they are wave shapes along the side directions in which they engage with each other. It may be shaped like a square wave or a sine wave. Further, the tips 32a and 34a of the film presser 30 may be formed of an elastic member other than silicon rubber, and the film presser 40 may be formed of a rigid member other than the heat-resistant resin. Further, even if the tips 32a and 34a of the upper film presser 30 form a concave groove extending in the lateral direction and the tips 42a and 44a of the lower film presser 40 form a convex groove extending in the lateral direction. good. Further, the cutter 50 is not limited to the shape as shown in FIG. 4, for example, the triangular wavy shape of the tip blade 50a moves upward from one end to the other end in the lateral direction of the cutter 50. It may have a slightly inclined shape.

Now, according to the embodiment of the present invention having the above configuration, it is possible to obtain the following effects. That is, as shown in FIGS. 1 and 2, the gusset bag sealing and cutting device 10 according to the embodiment of the present invention is a pair of heaters that weld and seal the film F by sandwiching the film F from above and below. It includes a pair of film retainers 30, 40, and a cutter 50 that press and fix the film F for cutting the film F by sandwiching the bars 12, 14 and the film F from above and below. The cutter 50 moves together with the upper film presser 30 and moves downward independently of the upper film presser 30 with the film F sandwiched between the pair of heater bars 12 and 14 and the pair of film pressers 30 and 40. By doing so, the film F is cut.

In the gusset bag sealing and cutting device 10 according to the embodiment of the present invention, since the pair of heater bars 12 and 14 are composed of the cartridge heater 16, it is necessary to cover the unexposed nichrome wire with glass tape or the like. There is no restriction on flattening the tip shapes of the heater bars 12 and 14. Therefore, as shown in FIG. 3, the pair of heater bars 12 and 14 are along the lateral direction such that the shapes of the tips 12a and 14a sandwiching the film F are engaged with each other by the pair of heater bars 12 and 14. It has a wavy shape. As a result, the area in contact with the film F can be increased as compared with the case where the tip shape is flat, and the tension of the film F can be applied at the apex 20 of the waves at the tips 12a and 14a to seal at the apex 20. can. Further, the wrinkles of the film F can be smoothed, and pressure can be applied more easily than sealing with a flat surface.

For this reason, not only is it unnecessary to adjust the upper and lower gaps of the heater bars 12 and 14, but it is also possible to seal at a lower temperature than before, and stable sealing is possible even if a heat pipe is not incorporated. Further, by lowering the temperature than the conventional one, it is possible to eliminate the need for the cooling plates on the film pressers 30 and 40 side among the external cooling plates conventionally attached to the front and rear of the heater bars 12 and 14. Therefore, although the cartridge heater 16 is adopted for the heater bars 12 and 14, the size of the device 10 can be suppressed to make it compact, and the degree of freedom in setting the position can be increased. In particular, by eliminating the need for one of the cooling plates, the distance between the heater bars 12 and 14 and the film retainers 30 and 40, in other words, the distance between the heater bars 12 and 14 and the cutter 50 is reduced. Therefore, it is possible to reduce the length of the ear remaining at the end of the gusset bag W. Further, since the tips 12a and 14a of the pair of heater bars 12 and 14 are wavy and have a lower temperature than the conventional one, the film F is melted because it is coated without using glass tape or the like. Does not adhere. Therefore, it is possible to improve the productivity of the product without the trouble of removing the adhered film F, the trouble of replacing the glass tape or the like, the trouble of removing the melted glass tape or the like from the heater bars 12 and 14. It becomes.

Further, in the gusset bag sealing and cutting device 10 according to the embodiment of the present invention, the pair of film pressers 30 and 40 that press the film F for cutting by the cutter 50 are shown in FIGS. 5 and 6. It has first presser portions 32, 42 for sandwiching the film F on the front side of the cutter 50, and second presser portions 34, 44 for sandwiching the film F on the rear side of the cutter 50. Therefore, when the film F is cut, the cutter 50 that moves together with the upper film presser 30 moves downward while being accommodated between the first presser portion 32 and the second presser portion 34 of the upper film presser 30. do. Then, the first presser portions 32, 42 of the pair of upper and lower film pressers 30 and 40 sandwich the film F, and the second presser portions 34 and 44 of the pair of upper and lower film presses 30 and 40 sandwich the film F. Then, the cutter 50 moves further downward independently of the upper film presser 30 and descends between the first presser portion 42 and the second presser portion 44 of the lower film presser 40, whereby the cutter 50 causes the cutter 50 to move further downward. The film F is cut. In this way, with the front and rear sides of the film F pressed, the film F is cut between them by the cutter 50, so that the quality of cutting can be stabilized.

Further, in the present embodiment, as shown in FIGS. 5 and 6, the tip 32a of the first presser portion 32 of the upper film presser 30 and the tip 34a of the second presser portion 34 extend laterally. At the same time, the tip 42a of the first presser portion 42 of the lower film presser 40 and the tip 44a of the second presser portion 44 form a concave groove extending in the lateral direction. Therefore, when the pair of film pressers 30 and 40 approach each other and sandwich the film F, the first presser portions 32 and 42 and the second presser portions 34 and 44 mesh with each other by the convex and concave portions. Since the film F is pulled by this aspect, the quality of cutting by the cutter 50 performed in that state can be further stabilized.

Moreover, since the combination of the ridges and dents extending in the lateral direction of the pair of film retainers 30 and 40 uniformly pulls the entire width direction of the film F, for example, the unevenness is repeated along the lateral direction. Compared to the provided tip shape, the presser marks are less likely to remain on the film F. Therefore, it can be suitably used particularly in the first presser portions 32 and 42 that sandwich the portion that remains as an ear even after being cut by the cutter 50.

Further, in the gusset bag sealing and cutting device 10 according to the embodiment of the present invention, the tip 32a of the first presser portion 32 and the tip 34a of the second presser portion 34 of the upper film presser 30 allow elastic deformation. The first presser portion 42 and the second presser portion 44 of the lower film presser 40 are formed of an elastic member, and are formed of a rigid member that suppresses elastic deformation. Therefore, when the upper and lower film pressers 30 and 40 abut against each other, the first presser portion 32 with respect to the concave tips 42a and 44a of the first presser portion 42 and the second presser portion 44 formed by the rigid member. The tips 32a and 34a forming the ridges of the second pressing portion 34 are pressed while being elastically deformed, so that the film F can be stably pressed without a gap. Further, since the ridges and the dents are in close contact with each other without directly depending on the depth of the dents of the dents, by forming the depths of the dents of the dents shallow, extra slack in the film F can be obtained. It can be avoided.

Moreover, silicon rubber is used as an elastic member forming the tip 32a of the first presser portion 32 of the upper film presser 30 and the tip 34a of the second presser portion 34, and the first presser portion 42 of the lower film presser 40 and A heat-resistant resin is used as a rigid member forming the second presser portion 44. Here, as described above, among the external cooling plates conventionally attached to the front and rear of the heater bars 12 and 14, if the cooling plates on the film presser 30 and 40 sides are eliminated, it can be confirmed in FIGS. 5 and 6. The heater bars 12 and 14 and the film retainers 30 and 40 are adjacent to each other. For this reason, heat is likely to be transferred to the first holding portions 32 and 42, which are particularly close to the heater bars 12 and 14, but since they are made of silicon rubber or a heat-resistant resin, the influence of heat is exerted. It can be difficult to receive.

Further, in the gusset bag sealing and cutting device 10 according to the embodiment of the present invention, the tip blade 50a of the cutter 50 has a triangular wavy shape along the side direction in the front-rear view as shown in FIG. In other words, it is a so-called jagged blade having a plurality of triangular blades 52. Further, also in the front view of FIG. 4, the tip blade 50a of the cutter 50 is a blade near the center in the lateral direction because the triangular wavy shape is slightly inclined upward from the center C in the lateral direction toward both sides in the lateral direction. The 52 protrudes downward from the blades 52 near both sides in the lateral direction. As a result, the film F is gradually cut from the vicinity of the center in the width direction (side direction) toward both sides by the cutter 50, so that the film retainers 30 and 40 sandwiching the film F at that time are used. It is possible to smoothly cut the heater bars 12 and 14 without applying an extra load.

On the other hand, in the gusset bag sealing and cutting device 10 according to the embodiment of the present invention, as shown in FIG. 7, the pair of film retainers 30 and 40 do not sandwich the film F on the front side of the cutter 50, but the cutter 50. A structure may be used in which the film F is sandwiched only on the rear side of the film F. That is, the pair of film pressers 30 and 40 do not have to have the first presser portions 32 and 42 that press the film F between the cutter 50 and the heater bars 12 and 14 in the front-rear direction. As a result, the distance between the pair of heater bars 12 and 14 and the cutter 50 can be made smaller, so that the length of the ears remaining at the end of the gusset bag W can be made smaller.

Further, because of the above configuration, when cutting the film F, the cutter 50 cuts the film F fixed by the pair of heater bars 12 and 14 and the pair of film retainers 30 and 40. It is something to do. That is, the pair of heater bars 12 and 14 is used not only for sealing the film F, but also for pressing the film F together with the pair of film retainers 30 and 40 when the film F is cut. At this time, the film F can be stably fixed by the wave shape of the tips 12a and 14a in which the pair of heater bars 12 and 14 are engaged with each other as shown in FIG. Therefore, although the structure of the pair of film retainers 30 and 40 is simplified, the film F can be cut by the cutter 50 in a sufficiently stretched state, so that the cutting quality of the film F can be maintained. can. Moreover, since the portion of the film F sandwiched by the pair of film pressers 30 and 40 is discarded as a surplus portion after being cut by the cutter 50, there is no problem even if a presser mark or a hole is formed there. Therefore, the pair of film retainers 30 and 40 is not limited to the tip shape as shown in FIG. 7, and any tip shape that more reliably fixes the film F can be adopted.

10: Gusset bag sealing and cutting device, 12, 14: Pair of heater bars, 12a, 14a: Tip of heater bar, 16: Cartridge heater, 30, 40: Pair of film pressers, 32, 42: First presser section , 32a, 42a: tip of first presser foot, 34, 44: second presser foot, 34a, 44a: tip of second presser foot, 50: cutter, 50a: tip blade, F: film, W: gusset bag

Claims (8)

The seal of the film for forming the gusset bag is sealed with the product filled inside, and the opening direction of the opening with the product side as the front side is the front-back direction. A gusset bag seal and cutting device that cuts the excess part on the rear side of the removed part.
A pair of heater bars that move in the vertical direction so as to approach each other and sandwich and seal the opening of the film from above and below.
A pair of film pressers that move in the vertical direction in a manner approaching each other at a position close to the pair of heater bars on the rear side to sandwich and press the film from above and below.
It moves together with the upper film retainer of the pair of film retainers, and with the film sandwiched between the pair of heater bars and the pair of film retainers, moves downward independently of the upper film retainer. Including a cutter for cutting the film,
The pair of film retainers sandwich the film at least on the rear side of the cutter.
The pair of heater bars are composed of cartridge heaters, and the tip of the film sandwiching the film is characterized in that the pair of heater bars engage with each other and form a wavy shape along the side direction in the front-rear direction. Gusset bag sealing and cutting device. The gusset bag sealing and cutting device according to claim 1, wherein the pair of heater bars has a coated tip. The pair of film pressers have a first presser portion for sandwiching the film on the front side of the cutter and a second presser portion for sandwiching the film on the rear side of the cutter. The described gusset bag sealing and cutting device. The gusset bag sealing and cutting device according to claim 1 or 2, wherein the pair of film retainers sandwich the film only on the rear side of the cutter. The pair of film retainers are characterized in that the tip of one film retainer forms a ridge extending in the lateral direction, and the tip of the other film retainer forms a concave stripe extending in the lateral direction. The gusset bag sealing and cutting device according to any one of claims 1 to 4. The gusset bag sealing and cutting device according to claim 5, wherein the pair of film pressers are formed by an elastic member at the tip of one film presser and a rigid member of the other film presser. The gusset bag sealing and cutting device according to claim 6, wherein the elastic member is silicon rubber and the rigid member is a heat-resistant resin. The tip blade of the cutter has a triangular wavy shape along the lateral direction in the front view, and the triangular wavy shape is slightly inclined upward from the center of the lateral direction to both sides in the lateral direction. The gusset bag sealing and cutting device according to any one of claims 1 to 7.

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